The company said that it would no longer allow trades with U.S. dollars on its platform. Customers were urged to withdraw funds by Tuesday.

The implosion of Three Arrows Capital, a cryptocurrency hedge fund, devastated the industry. Its two founders spent the next year surfing, meditating and traveling the…

Banks have signaled that they will stop working with the company’s American branch, it said, after the Securities and Exchange Commission sued it this week.

As the country becomes one of the world’s strictest crypto regulators, companies are exploring plans to expand internationally and possibly leave entirely.

Early adopters thought cryptocurrencies would be free from prying eyes. But tracking the flow of funds has become a big business.

Bitcoin’s price has soared since banks failed this month, but there’s little evidence that the surge is being driven by investors treating the virtual currency…

Mr. Kwon, the entrepreneur behind the failed TerraUSD and Luna cryptocurrencies, was headed to Dubai, Montenegro’s Interior Ministry said.

The agency charged Justin Sun with violations of securities law in a scheme involving the actress Lindsay Lohan and other celebrities.

State and federal agencies have levied fines, brought new cases and issued policy statements to rein in freewheeling practices in recent weeks.

The case was part of a crackdown on an old-school financial crime in the crypto world.